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Agricultural non-point nitrogen pollution control function of dierent vegetation types in riparian wetlands: A case study in the Yellow River wetland in China

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Journal of Environmental Sciences 2009年第7期21卷 933-939页

作者： ZHAO Tongqian XU Huashan HE Yuxiao TAI Chao MENG Hongqi ZENG Fanfu XING Menglin Institute of Resources and Environment Henan Polytechnic University Jiaozuo 454003 China Henan Province Environmental Monitoring Center Zhengzhou 450004 China

riparian wetland is the major transition zone of matter, energy and information transfer between aquatic and terrestrial ecosystems and has important functions of water purification and non-point pollution control. Using the field experiment method and an isotope tracing technique, the agricultural non-point nitrogen pollution control function of different vegetation types in riparian wetland was studied in the Kouma Section of the Yellow River. The results showed that the retention of agricultural non-point nitrogen pollution by riparian wetland soil occurs mainly in top 0-10 cm layer. The amount of nitrogen retained by surface soils associated with three types of vegetation are 0.045 mg/g for Phragmites communis Trin Linn, 0.036 mg/g for Scirpus triqueter Linn, and 0.032 mg/g for Typha angustifolia Linn, which account for 59.21%, 56.25%, and 56.14% of the total nitrogen interception, respectively. Exogenous nitrogen in 0-10 cm soil layer changes more quickly than in other layers. One month after adding KISNO3 to the tested vegetation, nitrogen content was 77.78% for P communis Trin, 68.75% for T. angustifolia, and 8.33% for S. triqueter in the surface soil. After three months, nitrogen content was 93.33% for P. communis Trin, 72.22% for S. triqueter, and 37.50% for T. Angustifolia. There are large differences among vegetation communities respecting to purification of agricultural non-point nitrogen pollution. The nitrogen uptake amount decreases in the sequence： new shoots ofP. communis Trin （9.731 nag/g）〉 old P. communis Trin （4.939 mg/g）〉 S. triqueter （0.620 mg/g）〉 T. angustifolia （0.186 mg/g）. Observations indicated that the presence of riparian wetlands as buffers on and adjacent to stream banks could be recommended to control agricultural non-point pollution.

关键词： riparian wetland vegetation community agricultural non-point source nitrogen pollution

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Responses of butachlor degradation and microbial properties in a riparian soil to the cultivation of three different plants

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Journal of Environmental Sciences 2011年第9期23卷 1437-1444页

作者： Changming Yang Mengmeng Wang Haiyan Chen Jianhua Li State Key Laboratory of PoUution Control and Resource Reuse Tongji University Shanghai 200092 China Key Laboratory of Yangtze River Water Environment of the Ministry of Education Tongji University Shanghai 200092 China

A pot experiment was conducted to investigate the biodegradation dynamics and related microbial ecophysiological responses to butachlor addition in a riparian soil planted with different plants such as Phragmites australis,Zizania aquatica,and Acorus *** results showed that there were significant differences in microbial degradation dynamics of butachlor in the rhizosphere soils among the three riparian *** displays a significantly higher degradation efficiency of butachlor in the rhizosphere soils,as compared with *** and ***-life time of butachlor degradation in the rhizospheric soils of ***,***,and *** were 7.5,9.8 and 5.4 days,*** butachlor concentration in *** rhizosphere soil was 35.2% and 21.7% lower than that in *** and *** rhizosphere soils,respectively,indicating that *** showed a greater improvement effect on biodegradation of butachlor in rhizosphere soils than the other two riparian *** general,microbial biomass and biochemical activities in rhizosphere soils were depressed by butachlor addition,despite the riparian plant ***,rhizospheric soil microbial ecophysiological responses to butachlor addition significantly （P 0.05） differed between riparian plant *** to *** and ***,*** showed significantly larger microbial number,higher enzyme activities and soil respiration rates in the rhizosphere *** results indicated that *** have a better alleviative effect on inhibition of microbial growth due to butachlor addition and can be used as a suitable riparian plant for detoxifying and remediating butachlor contamination from agricultural nonpoint pollution.

关键词： riparian wetland butachlor rhizospheric degradation soil microflora enzymatic activities basal respiration

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